Heating coil



Jan 6, [931. J. H. HOLTON ET AL HEATING COIL Filed April 11. 1928 2 Sheets-Sheet l INVENTO flo/fo.

' 1/0/71? 1% 41m William A." #017? v o o I NVENTORS f/alzaiz 2 Sheets-meet 2 HEATING COIL J. H. HOLTQN ET AL Filed April 11. 1928 Jan 6, 1931;

' Patented Jan. 6, 1931' "VUNITED STATES PATENT OFFICE JOHN H. HOLTON AND WILLIAM H. HORN, OF NORRISTOWN, PENNSYLVANIA, ASSIGN- ORS TO YORK HEATING AND VENTILATING CORPORATION, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA HEATING COIL Application filed April 11,

The present invention relates to radiator structures and more particularly to a coil and easing assembly whereby a heating or cooling medium is'circulated and to mount this system of tubes within a unitary casing which completely surrounds and encloses the ,p tubes on the top, bottom and ends while the sides are' left open for the passage of air into the casing through the tubes and out at the other side. Closed casings of this character have been found to be objectionable and open to many disadvantages in that the tubes for circulating the medium are rendered entirely inaccessible while the entire structure must be assembled as a complete unit I 'advantage is materially increased where the unitary casings are connected to air ducts and the casings of other units, so that repairs and changes are almost prohibitive in cost. Furthermore, it has been commonly the practice to employ tubular structures having oppositely arranged headers, and consequently in order to allow for expanslon and contraction the header plates must of necessity be formed of flexible material so that they can automatically compensate for such expansion and contraction without undue strain upon I the tube joints. This flexible tube plate con- 7 themselves.

struction necessitates a construction in which the tube assembly is entirely contained within a casing so that the delicate end plates of the headers are protected as well as the tubes Some of the objects of the present invention are to provide a coil and casing struc- .ture in which the two assemblies are com- 1928. Serial No. 269,270.

ponent parts of the same structure though readily divisible and separable so that the coil can be disconnected from and removed from the casing; to provide a structure in which the parts are readily accessible for cleaning and repair without disassembling the casing structure; to provide an efiicient tube radiator of the partially closed type which is simple in construction, cheap to manufacture, and highly efiicient in use and operation; to provide a casing mounting for a radiator structure wherein the latter can be readily removed and forms a part of one end of the enclosing casing; to provide a coil structure and casing structure which can be manufactured as two separate units with the one part arranged to interfit with and form a component part of the other; to provide a radiator structure which is readily accessible for cleaning and repairs without disturbing adjacent ducts or other radiators; and to provide other improvements as will hereinafter appear.

In the accompanying drawings, Fig. 1 represents a perspective of a heater unit embodying one form of the present invention; Fig. 2 represents a side elevation of the same; Fig. 3 represents an elevation of the header end of the unit; Fig. 4 represents an elevation of the other end of the unit; Fig. 5 represents a perspective of the three parts casing; Fig. 6 represents a perspective of the header and coil structure; and Fig. 7 represents a detail in plan of the closed end of the each including a tube plate with a closure 16 welded thereto. the latter in one instance having an inlet fitting 17 and iii the other instance an outlet or exhaust fitting 18. The

tube plates 15 are of relatively stiff nonflexing metal and in the preferred form are located in the same plane and welded together along a joint to form a common end plate which locates the headers directly adjacent each other. The headers 13 and 14 are connected by the tubes 12 arranged in loop formation, each tube having one end united to the tube plate of one header and the other end provided holes 25.

united to the tube plate of the other header. This arrangement allows for the free expansion and contraction of the tubes without stress or strain being placed upon the tube plates and jointsuniting the tubes wit-h the plates I v "The casing 11, as here shown, consists of a top plate 21, a bottom plate 22, and one end plate 23, the other end of the casing 11 be- 7 ing left open with no connection between thetop plate 21 and the bottom plate 22 until the radiator is placedin position andlthe two unconnecteduplates of the casing are then joined directly to the header structure of the radiator. The end plate 23 has its outer face bounded by an outstanding marginal flange 24 which-may serve forattaching another casing part thereto by means of bolts or other fastening devices passing through The inner face of the plate 23 mounts a vertically disposed socket 26 formed by asheet of material provided with two inwardly directed side wings 27 which form a seat for a shield 28 fittedabout the return bend end of the tube coils andv serving to protect said ends. 7 Fixed to the upper and lower l spectively across the .top and bottom of the return bends of the coil; Stay rods 313K- tend from one strip 30 to the other passing through thereturn bends in oont-actwith adjacent coils so that the latterare firmly held in proper staggered relation. in the present construction, one of these stay rods 31 pro,-

jects at both ends throughthe strips 30, and

these ends are respectively provided with rollers32 rldlng in two grooves 33 and 34'. The groove 33 is formed'in a sheet baffle 35-lixed' to thetop plate 21 and shapedfto close an otherwise open passage between the coiland the :top plate 21, while the grove 34 isforrned in a sheet bafile' 36'fixcd to the bottom plate 22 and shaped to close an otherwise open passage between the coil and the bottomplate 22. These grooves 33 and 34 are substantially of dove-tail'form in order to receive 'the base of a wedge shaped insert battle 37,-the function of which is to supplement the ballies 35 and 36 in I order to close the space created by the downward pitch of the coils. Because ofthi-s pitch of the coils, each'bafile 37 is shaped with an inclination conforming to the coil pitch Iso that'the transverse opening of gradually decreasing height is entirely clos-zedlwhenthe V f 'bafiies 37 are-slid into place in the respective rooves33 and 34. When in place, one end of each baftle'3'7 is against the stay-rod 32 and the other end of each baffle 37in abutting re- .lation with the plate 15. Thus the air enter- 7 ing from one openside of the casing is obliged to pursue acourse throughand between the ends of the shield 28 are bar strips 30'which extendreseveral tube coils and no loss in eficiency oc curs because none of the air can find unrestricted passages at the top and bottom of the coil unit. 7

F or side to side connection of other units,

' the top and bottom plates 21 and 22 are respectively provided with. side'edge flanges 38 provided with'bolt holes 40. At theopen end of the three sided casingthe end flanges 41 are respectively arranged in i'nterfitting relation with transverse. angle bars 42 which are held in place by the same bolts 43 that Clamp the header plate 15 in position. In assembled condition, the horizontal projecting sides of'the angle bars 42 lie in the respective shaped baflles 37 are now placed in position with oneend of each seating in the entrance .of itsrespective groove whereupon the coil unit can be pushed intolthe casing. "During this'movement the header plate 15 abuts the projecting ends of the (two ba'flies 37-and the latter are'thereby caused to slide into the grooves until the proper assembled position of the coil is (reached. The bolts 43 are now fastened in place and the coil is ready for connectingto the supply of heating medium. While, in'the foregoing reference has'been more particularly made to heating, it is to ;be understood the invention is not limited but is broadly a heat transfer unit and comprehends use asa cooling device as well.

'Whilejonly a single form is shown in which vthis invention may: be embodied, it is to be understood that the invention is :not limited to anyrspecific construction, but'might be appliedxto various forms without departing from the.s pirit'oftheinvention or the scope of the appended claims. l i :1;

Having thus described our invention, we

claim:

H 1. v heat transfer unitic omprising a casmg openrat one end, in COIX1lQ1112113l0I1' with a 7 unitary assembly separatefrom said casing including two headers, and return bend tubes having ends respectively communicating with said headers, means to removably con- 1;: 'nect sald headers as a closureover the open end of saidcasing and with said tubes within 7 said casing, clamping means 7 for the return bend'portion of said tubes, and a socket attached to said casingqfor receiving the clamped portion ofsaid tubes, 5

2. A heat transfer unit; comprising atnbe structure including aheader, a casingopen at both s des andlone endarral iged cto receive said tube structure, and" meansito'removably secure. the open end of said casing to said header.

3. A heat transfer unit comprising a tube structure including a header, a casing open at both sides and one end arranged to receive said tube structure, a frame formed at the closed end of said casing to form a socket to seat one end of said tube structure, and means to removably secure the open end of said casing to said header.

4. A heat transfer unit comprising a casing having top and bottom plates provided respectively with longitudinally disposed grooves, a coil structure, guide members at opposite sides of said coil structure arranged to slide in said grooves respectively, and means for removably attaching said coil structure to said top and bottom plates.

5. A heat transfer unit comprising a casing having top and bottom plates, bafile members attached to said plates respectively and provided with longitudinally disposed grooves, a coil structure, guide members at opposite sides of said coil structure arranged to slide in said grooves respectively, and means for removably attaching said coil structure to said top and bottom plates.

6. A heat transfer unit comprising a casing having top and bottom plates, baflie members attached to said plates respectively and provided with longitudinally disposed grooves, a coil structure, guide members at opposite sides of said coil structure arranged to slide in said grooves respectively, bafiles respectively mounted to slide in said grooves, and means for removably attaching said coil structure to said top and bottom plates.

7 A heat transfer unit comprising a casing open at one end and two sides, in combination with a header and tubes forming a unitary assembly separate from said casing,

and means to removably connect said header as a closure over the open end of said casing and with said tubes within said casing in the path of air traversing said casing.

8. A heat transfer unit comprising a casing open at one end and two sides, in combination with a header and tubes forming a unitary assembly separate from said casing, means to removably connect said header as a closure over the open end of said casing and with said tubes Within said casing in the path of air traversing said casing, and a support secured to said'casing for seating the inner end of said tubes. I

'9. A heat transfer unit comprising a casing open at one end and two sides, in combination with a unitary assembly separate from said casing including two headers and return bend tubes having ends respectively communicating with said headers, and means to removably connect said headers as a closure over the open end of said casing and with said tubeswithin said casing in the path of air traversing said casing.

Signed at Bridgeport, county of Montgomery, State of Pennsylvania, this 15th day 

